Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53e1555h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P53E-1555
Computer Science
Sound
[5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5445] Planetary Sciences: Solid Surface Planets / Meteorology, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Mars Global Surveyor (MGS) monitored temperatures in the Martian atmosphere through infrared sounding by the Thermal Emission Spectrometer (TES) as well as radio occultation (RO) experiments. Direct comparisons between TES nadir and RO temperature profiles have generally confirmed the accuracy of the results at high northern latitudes during spring and summer (Hinson et al., J. Geophys. Res., 109, E12002, 2004). We now extend these comparisons to observations obtained at high northern latitudes during autumn, when the temperatures are colder and the dynamics are more vigorous than in spring and summer. This research addresses two important questions concerning the thermal structure, dynamics, and energy balance of the polar atmosphere. First, how reliable are measurements that indicate super-saturation of carbon dioxide? Our initial comparisons between nearly coincident TES and RO measurements reveal situations where TES gives a false indication of strong super-saturation in the lowest scale height above the surface. The accuracy of the temperature profiles is affected by several factors, but one factor appears to be largely responsible for this discrepancy. The limited vertical resolution of the TES profiles reduces their accuracy in cases where the static stability varies strongly with height. Second, what is the relative performance of the two sounders in observations of shallow baroclinic eddies? We have addressed this question by applying the same method of space-time analysis to both types of data. The results agree closely with few exceptions, providing consistent characterizations of both baroclinic eddies and stationary waves. The weather in the lowest scale height above the surface varies strongly in response to baroclinic wave transitions, abrupt shifts in the frequency and zonal wave number of the dominant eddy mode. This research is supported by grant NNX08AL24G of the Mars Data Analysis Program.
Hinson David P.
Smith Masson D.
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